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Analog Devices Inc. LTC3807HFE#PBF
- Part No.:
- LTC3807HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3807HFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,941
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Product details
Overview
LTC3807HFE#PBF from Analog Devices (formerly Linear Technology) is a high-performance, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4V to 38V input, delivers 0.8V–24V output, supports phase-lockable switching up to 750kHz, and features 50μA no-load IQ - optimized for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3807HFE#PBF datasheet, LTC3807HFE#PBF pinout, LTC3807HFE#PBF application, or LTC3807HFE#PBF equivalent, key selection criteria include its 150°C junction-rated TSSOP package, selectable light-load modes (Burst/Pulse-Skipping/Continuous), RSENSE or DCR current sensing, OPTI-LOOP® compensation, and precision 0.8V reference with power-good monitoring.
Technical Context
The LTC3807HFE#PBF implements a constant-frequency current-mode control architecture with dual gate drivers (TG/BG), internal 5.1V LDO (INTVCC), and flexible biasing via EXTVCC switchover at 4.7V. Its error amplifier (EA) compares VFB against a trimmed 0.800V reference, modulating ITH to regulate peak inductor current.
Light-load behavior is programmable via PLLIN/MODE: grounding selects Burst Mode (50μA IQ), tying to INTVCC forces continuous conduction, and applying 1.2V–(INTVCC−1.3V) enables pulse-skipping. Current limit threshold is set by ILIM (GND/FLOAT/INTVCC), and soft-start/tracking is controlled by the 10μA-pulled TRACK/SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports wide intermediate bus and battery chemistries including 12V/24V automotive systems. |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider on VFB; enables single-controller flexibility across multiple rail requirements. |
| No-Load Quiescent Current | 50μA in Burst Mode - extends runtime in battery-backed or always-on applications without compromising regulation accuracy. |
| Switching Frequency Range | 75kHz to 750kHz (phase-lockable) or 50kHz to 900kHz (fixed) - allows EMI optimization and inductor size reduction while maintaining stability. |
| Reference Voltage Accuracy | ±1% over –40°C to 150°C (0.786V–0.812V) - ensures tight output regulation across full industrial+automotive temperature range. |
| Gate Driver Strength | TG/BG pull-up: 2.5Ω/2.4Ω; pull-down: 1.5Ω/1.1Ω - drives high-side and synchronous low-side N-MOSFETs with fast 13–25ns transitions (3300pF load). |
| Current Sense Options | RSENSE or DCR sensing - supports high-efficiency, low-heat dissipation designs using either discrete shunt or inductor DCR. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE), exposed pad (Pin 21) soldered to SGND for thermal performance; rated for –40°C to +150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TRACK/SS (Pin 1) | Soft-start & tracking control input | Internal 10μA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor-divider voltage for supply tracking during startup. |
| FREQ (Pin 2) | VCO frequency programming | 20μA internal pull-up sets oscillator frequency; GND = 350kHz, INTVCC = 535kHz, resistor-to-GND enables 50–900kHz tuning. |
| PLLIN/MODE (Pin 3) | Light-load mode selection & sync input | GND = Burst Mode (50μA IQ), INTVCC = forced continuous, 1.2V–(INTVCC−1.3V) = pulse-skipping; external clock synchronizes TG edge. |
| RUN (Pin 6) | Enable/shutdown control | <1.16V disables regulation; <0.7V shuts down entire IC (14μA IQ); internal 7μA pull-up enables floating-for-always-on operation. |
| SENSE– / SENSE+ (Pins 7/8) | Differential current sense inputs | Measure voltage across RSENSE or DCR network; common-mode range up to 28V enables high-side sensing in buck configurations. |
| VFB (Pin 9) | Feedback input | Compares output voltage (via resistive divider) to 0.800V reference; ±5nA input bias minimizes divider error. |
| ITH (Pin 10) | Error amplifier output & compensation node | Controls peak inductor current; connects to RC/CC network for OPTI-LOOP® compensation across wide ESR/capacitance ranges. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from setpoint; 25μs fault delay prevents false triggering during transients. |
| TG (Pin 12) | Top-gate driver output | Floating driver with swing = INTVCC superimposed on SW node; supports high-side N-MOSFET with bootstrap capacitor (BOOST–SW). |
| SW (Pin 13) | Switch node connection | Connects to inductor and BOOST capacitor; handles high dv/dt; requires low-inductance layout to minimize ringing. |
| BOOST (Pin 14) | Bootstrap supply for top gate | Charged via Schottky diode from INTVCC; voltage swing = INTVCC to (VIN + INTVCC); dropout detector refreshes CB every 10 cycles near 99% duty. |
| BG (Pin 15) | Bottom-gate driver output | Drives synchronous N-MOSFET source-to-PGND; 0V to INTVCC swing enables efficient low-side switching with minimal dead-time loss. |
| INTVCC (Pin 16) | Internal LDO output | 5.1V ±3%, supplies drivers and control logic; decoupled with ≥2.2µF ceramic to PGND; bypassed by EXTVCC when >4.7V. |
| EXTVCC (Pin 17) | External bias input | Enables higher-efficiency INTVCC sourcing from regulated output (e.g., VOUT); must be ≤14V and not floated. |
| PGND (Pin 18) | Power ground return | Return path for bottom MOSFET source and CIN negative terminal; separate from SGND to avoid noise coupling into sensitive analog circuitry. |
| VIN (Pin 19) | Main input supply | 4V–38V input; bypassed with ceramic capacitor to SGND pins; powers internal VIN-LDO when EXTVCC is inactive. |
| ILIM (Pin 20) | Current limit threshold select | GND = 22mV, FLOAT = 43mV, INTVCC = 64mV (typical) - sets maximum sense voltage before foldback activation during short-circuit. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Transconductance amplifier (gm = 2 mmho) enables stable loop response across diverse output capacitors (ceramic, polymer, electrolytic) and ESR values without redesign. |
| 99% Maximum Duty Cycle | Supports ultra-low dropout operation (e.g., 24V→23.5V), critical for post-regulation in high-input-voltage systems where minimum VIN–VOUT margin is constrained. |
| Programmable Light-Load Modes | Three distinct operating modes (Burst/Pulse-Skip/Continuous) selected via single pin - balances efficiency, ripple, and EMI for each load condition. |
| Output Overvoltage Protection | Hardware-based OVP triggers at +7% to +13% above regulated VFB (–13% to –7% for undervoltage), independent of feedback divider integrity. |
| Low Shutdown IQ (14μA) | Enables long-term storage or deep-sleep states in portable equipment; RUN pin hysteresis (50mV) prevents oscillation near threshold. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Powering infotainment, telematics, or ADAS modules that remain active during vehicle sleep mode (e.g., CAN wake-up receivers). IC Role / Device Role / Timing Role: Primary step-down controller regulating 12V battery to 3.3V/5V/8.5V rails with ultra-low quiescent current. Use Value: 50μA no-load IQ and 150°C-rated TSSOP package ensure reliable operation over full automotive temperature range without thermal derating. |
Use Scenario: Supplying FPGA core, microcontroller, or RF transceiver in handheld medical or IoT sensors with multi-year battery life. IC Role / Device Role / Timing Role: High-efficiency buck controller enabling dynamic voltage scaling and adaptive light-load mode selection. Use Value: Burst Mode operation maintains >85% efficiency at 100μA load, extending battery runtime while preserving fast transient response. |
| Distributed DC Power Systems | Industrial Control & PLC Modules |
Use Scenario: Intermediate bus conversion in 24V/48V factory automation systems powering isolated I/O, sensors, and actuators. IC Role / Device Role / Timing Role: Wide-input (4V–38V), high-accuracy (±1%) controller supporting multiple output voltages from single board design. Use Value: Phase-lockable 75–750kHz frequency allows synchronization across multiple converters to suppress beat frequencies and simplify EMI filtering. |
Use Scenario: Regulating 24V field bus to 5V logic and 3.3V MCU rails in harsh industrial environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust synchronous buck controller with integrated OVP, UVLO hysteresis, and 150°C junction rating. Use Value: 0.8V reference tolerance (±12mV) and load regulation (±0.1%) ensure stable digital logic supply despite varying line/load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891HDE#PBF | Includes integrated 5V/150mA bias supply and dual-channel capability; wider 4.5V–60V input; higher 100μA IQ in Burst Mode. | Preferred for dual-output or systems requiring auxiliary bias rail; less suitable for space-constrained single-rail designs. | Select LTC3891HDE#PBF when needing integrated bias generation or dual-phase operation; LTC3807HFE#PBF remains optimal for cost-sensitive, single-output, ultra-low-IQ applications. |
| MP2918GL-Z | Monolithic 6A buck converter (integrated MOSFETs); fixed 500kHz frequency; 30μA IQ; no PLL sync or DCR sensing. | Suitable for lower-current, compact designs where integration outweighs flexibility; lacks programmable light-load modes and wide VOUT range. | Choose MP2918GL-Z for simplified BOM and footprint in ≤6A applications; LTC3807HFE#PBF offers superior scalability, thermal management, and design adaptability for >10A systems. |
Compared with LTC3891HDE#PBF and MP2918GL-Z, the LTC3807HFE#PBF delivers unmatched combination of ultra-low 50μA IQ, 0.8V–24V programmable output, phase-lockable frequency, and robust 150°C operation - making it ideal for high-reliability, thermally constrained, and battery-sensitive applications where discrete FET control is required.
Availability
LTC3807HFE#PBF is available at Aetrix Electronics and suitable for automotive always-on systems, battery-powered digital devices, and distributed DC power systems requiring stable component supply with extended temperature support and long-term lifecycle assurance.
Supply support for LTC3807HFE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017, inheriting its legacy of high-performance power management ICs with emphasis on precision, efficiency, and ruggedness.
The LTC3807HFE#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding industrial and automotive applications requiring wide input range, low quiescent current, and guaranteed operation up to 150°C junction temperature.
FAQ
What is the maximum junction temperature rating for the LTC3807HFE#PBF?
The LTC3807HFE#PBF is specified for operation from –40°C to +150°C junction temperature, with absolute maximum TJ of 150°C. This H-grade variant uses the TSSOP package with θJA = 38°C/W and requires proper PCB copper area under the exposed pad (Pin 21) soldered to SGND to achieve rated thermal performance.
How does the LTC3807HFE#PBF implement current sensing - RSENSE or DCR?
The LTC3807HFE#PBF supports both RSENSE and DCR current sensing via differential SENSE+ and SENSE– inputs. It accommodates common-mode voltages up to 28V and provides three selectable current limit thresholds (22mV/43mV/64mV typical) via the ILIM pin, enabling flexible, high-accuracy sensing in high-efficiency buck designs.
Can the LTC3807HFE#PBF synchronize its switching frequency to an external clock?
Yes, the LTC3807HFE#PBF can synchronize its switching frequency to an external clock applied to the PLLIN/MODE pin. When an external clock signal is present, the internal phase-locked loop aligns the rising edge of the TG signal to the rising edge of the external clock, enabling noise-sensitive systems to avoid beat frequencies and simplify EMI compliance.
What is the purpose of the TRACK/SS pin on the LTC3807HFE#PBF?
The TRACK/SS pin on the LTC3807HFE#PBF serves dual functions: soft-start and supply tracking. An internal 10μA current source charges an external capacitor to generate a linear voltage ramp, controlling VOUT rise time. Alternatively, connecting a resistor divider from another supply allows the LTC3807HFE#PBF output to track that supply during startup, preventing sequencing violations.
Does the LTC3807HFE#PBF include output overvoltage protection?
Yes, the LTC3807HFE#PBF includes hardware-based output overvoltage protection. It monitors VFB relative to the regulated reference and asserts PGOOD low and disables switching if VFB exceeds +7% to +13% (or falls below –7% to –13%). This protection operates independently of the feedback resistor divider, enhancing system safety in fault conditions.
LTC3807HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 38V
- Frequency - Switching:
- 50kHz ~ 900kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3807HFE#PBF FAQ
1.How can I place an order for LTC3807HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807HFE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3807HFE#PBF reliable?
The price and inventory of LTC3807HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3807HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807HFE#PBF?
LTC3807HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807HFE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3807HFE#PBF?
For technical support, including LTC3807HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807HFE#PBF requirements.
6.How does Aetrix verify that LTC3807HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3807HFE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3807HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3807HFE#PBF?
All LTC3807HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807HFE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3807HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3807HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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